Dust collector



Jan. 3, 1950 5, s, MElSLER 2,493,156

DUST COLLECTOR Filed Feb. 21, 1947' JNVENTOR.

JIDNE) 5. M05452 I) A TUBA/5Y5 Patented Jan. 3, 1950 UNITED STATESPATENT OFFICE DUST COLLECTOR Sidney S. Meisler, New York, N. Y.

Application February 21, 1947, Serial No. 730,007

2 Claims.

This invention relates to dust collectors and more particularly to dustcollectors wherein air having dust particles entrained therein is leadinto the collector at relatively high speed for the purpose ofdepositing the entrained dust therein and is ultimately lead out of saidcollector substantially free of dust.

One object of this invention is the provision of such a dust collectorof greatly reduced overall dimensions capable of delivering airtherefrom from which dust has been removed to an extent not heretoforeattained.

Another object is the provision of such a dust collector having asimplified structure and which will entrap a greater variety of dustparticles.

A still further object of this invention is the provision of such adevice which may be manufactured at a cost considerably smaller thanheretofore possible.

Heretofore, in collectors which I have known? the rate of speed at whichthe air moved in collectors of this type has been alternately increasedand decreased. Thus, another object of this invention is the provisionof a collector which maintains, then rapidly increases the' rate ofspeed of the air in the device and finally provides for a great andrapid decrease in said speed in order to attain practically totalseparation of the entrained dust particles from said air.

Yet another object is the provision of such 'a device wherein thevarious parts have been disposed in such an angular relationship thatmaximum efliciency is attained for all proportional variations in thedimensions of the collector without any variation in said angularrelationship.

Other objects and novel features will appear as the nature of theinvention is better understood, the invention consisting in the novelarrangement and corelation of parts herein fully described, andillustrated in the accompanying drawings, wherein similar referencecharacters are used to denote corresponding parts throughout the severalviews, and then finally pointed out and specifically defined andindicated in the appended claims.

The disclosure made the basis of exemplifying the present inventiveconcept suggests a practical embodiment thereof, but the invention isnot to be restricted to the exact details of this disclosure and thelatter, therefore, is to be understood from an illustrative, rather thana restrictive standpoint.

In carrying out an embodiment of the invenlindrical housing with aninverted truncated cone shaped member depending therefrom. Suspendedwithin said housing and concentric therewith a cylindrical body,substantially narrower than said housing is open at its upper end andhas depending from its lower edge a double walled member the walls ofwhich converge at the point of juncture with said cylindrical body. Thehousing together with the members suspended therein form an annularchamber which is considerably constricted along its lower end where itopens into the base of the inverted cone shaped memher. A duct openinginto said annular chamber and tangentially disposed with respect to thesame serves as the means through which air is introduced thereto; whileany type pumping means such as a turbine connected to the duct and to asource of dust laden air supplies a stream of air as desired.

In the drawings:

Figure 1 is a top plan view of the device conf structedin accordancewith this invention with the inner structure and with a turbine and dustreceptacle shown in dot and dash lines.

Referring now to the drawings in detail, a

.'.cylindrical housing In, having an annular flange H at its upper end,has depending from its lower edge a funnel or inverted truncated coneshaped member l2 the base of which is equivalent to and co-extensivewith the base of said housing.

. Suspended in said housing In and connected to flange H, a cylindricalbody l3, substantially narrower than and concentric with the housing hasan air outlet opening 32 at its upper end and has depending from itslower edge a double walled member M the walls of which converge at thejuncture of said double walled member M with said cylindrical body 13.

"The inner wall l5 of member I4 is also in the shape of a funnel orinverted truncated cone, while the outer wall l6 substantially shorterthan the inner wall has a cone shaped portion ll which merges into anarrow cylindrical portion 18. A band [9 connects the ends of walls l5and Iii, sealing the space therebetween.

Cylindrical body [3 and outer wall It together with housing I0 form anannular chamber 20,

the cross sectional area of which is restricted 1 by portion. I! of wall"5. Cylindrical portion 18 of wall I6 projects: below housing It) intothe may alsosbe connected to an air turbine-21 or the like for supplyinga stream of dust laden air 28 from grinding wheels, buflflng andpolishing-,--

wheels, wood saws and the like (not shown here! in) to chamber 20.

Annular chamber opensgthrough-opening. 2| into an expansion chamber 29,formed bythe.

and 3| and when leaving through outlet 32 has undergone a 75% reductionin speed or leaves travelling at approximately 1,000 feet per minute orless if as in the given situation the speed at the inlet was 3,000 to4,000 feet per minute.

Experimentation and tests disclosed that the angular disposition of thethree cones I5, I! and I2 and band I9 with respect to housing I0 orcylinder I3 determined the efficiency of the device and that :maximumefficiency was attained only from a small range of angular values. Itwas also found that the critical range lay within one degree of thefollowing values and that a departure therefrom resulted in materialloss of efliciency. The angle between housing I 0 andcollector-I2-,'-angle A of Figure 2 was found to be sides of collector22 and band I9,'which in tum" is increased approximately three times sothat a cyclonic aerodynamic reaction, occurs in expan; sion chamber 29which separates the entrained dust from the air, permitting the dust'tosettle downwardly along the surface of collector l2 into a receptacle33.

I Inoperation, a stream of dust laden ai'ripasses through the,turbine,2! and duct 26; entering neck 24 throughcollar 25 travelling between3,000 and 4,000 feet 'per minute. a a a In neck 24 the air streamspread-so as to be, rectangular in. cross section. and to more nearlyapproximate the height of chamber 20 without any loss in speed since noexpansion of the stream of air is permitted inasmuch as the crosssectional area of neck 24 throughout its length is substantially thesame as the. cross sectional area .of duct 26. ,The air stream, onentering chamber 20 whirls downwardly through the same tow'ardropenlng2I, its speed of travel increasing and attaining in this particularillustration arate of approximately 10,000 .feet per minute. As the rateof speed is increased substantially all the dust rparticles carried bythe air are drivenv outwardly by 'centrifugal'forc untilithey arewhirling around chamber'20 adjacent the surface of housing I0. 'Whenthis stream of air travelling at higl r'speed with the dust particlesentrainedat itsperipherypasses through opening 2|, it "expandsinstantaneously and thereby undergoes a sudden decrease in speed. As thestream'enters the second expansion chamber there has been a 25%reduction in the rate of speed'at which the airstream originally enteredchamber 20." The dust particles being against the surface of the"housing and then against the surface'of collector I I2 -by rea'son ofcentrifugal force, continue'travelling the surface of collector I2because of inertia when the aforesaid drop in speed-of the air streamtakes place, and settle downwardly through aadust-outlet opening 34formed in the lower end thereof into receptacle 33. 2 a

Tests have shown thatportions of-the air stream traveldownwardly in thecollector I2 approximately the'length thereof and -no'more. The airstream passes upthrough chambers 30 .170, degrees ,th at. between innerwall I5 and cylinder I3 angle B, 165 degrees; that between outer wall 16and cylinder I3, angle C, 170 degrees; and that between band I9 extendedand collector I2; angle 1;), degrees.

wBy-rmaintaining these angles constant the dimensionsof the'yariousportions of the device ofitsreduced size, may be readily used in closeproximity'to thesource of dust.

g It 'ls' apparent that the illustrations shown above have, been givensolely by way of illustration and not by way of limitation and that theabove, ,examples.,are subject to variations and 4 modificaticnswithinthe scope of the appended claimsn iAllsuch variations and modificationsare-tabeincluded within the scope of the pres ent invention,

--Wl 1at -is claimed is:

H1 sAe dustwcollector. comprising: a cylindrical heusing, aninvertedtruncated cone, shaped collectorat-the-lower endof said housing,a cylindrical bodysuspended in said housing having an axial'airoutletopen-ing-at its upper end, an inner -'invertedtruncated-coneshaped wall connected testhe lowei end 0f said cylindrical body andopeningi-nto-said inverted cone shapedcollector,

an outer'truncated cone shaped wall converging withsaideinnerwall-attheaupper end thereof and having a cylindricallyshaped lower end, an

, assimilateband sealingly connecting the lower ends of said walls, saidcylindrical body and said outer cone-shaped wallebeingspaced from saidhousingto form an annular chamber having decreasingcross-sectional areatoward the lower end 'thereof, and an; inlet neck connected to saidhousing and arranged todischarge dust laden air circumferentially ofsaid annular chamber, said inverted cone shaped ccllectoiw and said bandforming; an-expansion chamber communicating a with said annular chamber,said inner wall formbetween 169; to 171- degrees, wherein said.cylindrical body and said inner inverted cone shaped 2,493,156 5 v wallform an internal angle ranging between 164 REFERENCES CITED to 166degrees, wherein said cylindrical body and The following references areof record m the said outer cone shaped wall form an external me of thispatent. angle ranging between 169 to 171 degrees, and

wherein said annular band is disposed at an angle 5 N TE TATES PATENTSranging between 59 to 61 degrees with respect to Number Name Date saidinverted cone shaped collector. 969,769 Brassert et a1 Sept. 13, 1910989,939 Alllngton Apr. 18, 1911 SIDNEY MEISLER" 1,316,988 Wegner..Sept.23, 1919

